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dhcp.py
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Code Editor : dhcp.pyo
� �jbc @ sM d d l Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l m Z m Z m Z m Z d d l m Z d d l m Z d d l m Z d d l m Z e j e � Z d Z d e f d � � YZ d e f d � � YZ d e f d � � YZ d d � Z d � Z d � Z d � Z d d � Z! d d � Z" d � Z# d S( i����N( t EphemeralIPv4Networkt find_fallback_nict get_devicelistt has_url_connectivity( t mask_and_ipv4_to_bcast_addr( t temp_utils( t util( t StringIOs /run/systemd/netif/leasest InvalidDHCPLeaseFileErrorc B s e Z d Z RS( s� Raised when parsing an empty or invalid dhcp.leases file. Current uses are DataSourceAzure and DataSourceEc2 during ephemeral boot to scrape metadata. ( t __name__t __module__t __doc__( ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR s t NoDHCPLeaseErrorc B s e Z d Z RS( s' Raised when unable to get a DHCP lease.( R R R ( ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR $ s t EphemeralDHCPv4c B sM e Z d d d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( c C s( | | _ d | _ d | _ | | _ d S( N( t ifacet Nonet _ephipv4t leaset connectivity_url( t selfR R ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt __init__* s c C s< | j r2 t | j � r2 t j d | j � d Sn | j � S( sU Setup sandboxed dhcp context, unless connectivity_url can already be reached.s: Skip ephemeral DHCP setup, instance has connectivity to %sN( R R t LOGt debugt obtain_lease( R ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt __enter__0 s c C s | j � d S( s Teardown sandboxed dhcp context.N( t clean_network( R t excp_typet excp_valuet excp_traceback( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt __exit__; s c C s< | j r d | _ n | j s" d S| j j d d d � d S( s@ Exit _ephipv4 context to teardown of ip configuration performed.N( R R R R ( R ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR ? s c C sW | j r | j Sy t | j � } Wn t k r? t � � n X| sR t � � n | d | _ t j d | j d | j d | j d � i d d 6d d 6d d 6d d 6d d g d 6d d 6} | j | � } | d s� t | d | d � | d <n | d rt | d � | d <n | j r1| j | d <n t | � } | j � | | _ | j S( s9 Perform dhcp discovery in a sandboxed environment if possible. @return: A dict representing dhcp options on the most recent lease obtained from the dhclient discovery if run, otherwise an error is raised. @raises: NoDHCPLeaseError if no leases could be obtained. i����s# Received dhcp lease on %s for %s/%st interfaces fixed-addresss subnet-maskt ipt prefix_or_masks broadcast-addresst broadcasts rfc3442-classless-static-routess classless-static-routest static_routest routerst routerR ( R t maybe_perform_dhcp_discoveryR R R R R t extract_dhcp_options_mappingt bcipt parse_static_routesR R R R ( R t leasest nmapt kwargst ephipv4( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR G s: c C sb i } xU | j � D]G \ } } t | t � rD | j | | | � q | j j | � | | <q W| S( N( t itemst isinstancet listt get_first_option_valueR t get( R R* t resultt internal_referencet lease_option_names( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR& q s c C s= x6 | D]. } | j | � s | j j | � | | <q q Wd S( N( R1 R ( R t internal_mappingR4 R2 t different_names( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR0 ~ s N( R R R R R R R R R& R0 ( ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR ) s * c C s� | d k r5 t � } | d k rX t j d � g Sn# | t � k rX t j d | � g St j d � } | s~ t j d � g St j d t d d d t � � } t | | | � SWd QXd S( s� Perform dhcp discovery if nic valid and dhclient command exists. If the nic is invalid or undiscoverable or dhclient command is not found, skip dhcp_discovery and return an empty dict. @param nic: Name of the network interface we want to run dhclient on. @return: A list of dicts representing dhcp options for each lease obtained from the dhclient discovery if run, otherwise an empty list is returned. s1 Skip dhcp_discovery: Unable to find fallback nic.s8 Skip dhcp_discovery: nic %s not found in get_devicelist.t dhclients7 Skip dhclient configuration: No dhclient command found.t rmtree_ignore_errorst prefixs cloud-init-dhcp-t needs_exeN( R R R R R R t whichR t tempdirt Truet dhcp_discovery( t nict dhclient_patht tdir( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR% � s" c C s t j d � } g } t j | � } t | � d k rN t d j | � � � n x� | j | � D]� } g } x` | j d � D]O } | j � j d d � j d d � } | s� qz n | j | j d d � � qz W| j t | � � q^ W| st d j | � � � n | S( s Parse the given dhcp lease file for the most recent lease. Return a list of dicts of dhcp options. Each dict contains key value pairs a specific lease in order from oldest to newest. @raises: InvalidDHCPLeaseFileError on empty of unparseable leasefile content. s lease {(?P<lease>[^}]*)}\ni s& Cannot parse empty dhcp lease file {0}t ;t "t s option t i s1 Cannot parse dhcp lease file {0}. No leases found( t ret compileR t load_filet lenR t formatt findallt splitt stript replacet appendt dict( t lease_filet lease_regext dhcp_leasest lease_contentR t lease_optionst line( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt parse_dhcp_lease_file� s& $ c C s� t j d | � t j j | d � } t j | | � t j j | d � } t j j | d � } t j | t j � s} | } n t j d d d d | d g d t �| d d d | d | | d d g } t j | d t �t j | | g d d d d �} | r't j d d j d � | D� � � g Sd } x� t d d � D]� } t j | � j � } y t | � } Wn t k r{nI Xt j | � } | d k r�t j d | � t j | t j � t | � St j d � q=Wt j d | | d � t | � S( s� Run dhclient on the interface without scripts or filesystem artifacts. @param dhclient_cmd_path: Full path to the dhclient used. @param interface: Name of the network inteface on which to dhclient. @param cleandir: The directory from which to run dhclient as well as store dhcp leases. @return: A list of dicts of representing the dhcp leases parsed from the dhcp.leases file or empty list. s! Performing a dhcp discovery on %sR7 s dhclient.pids dhcp.leasesR t linkt sett devt upt captures -1s -vs -lfs -pfs -sfs /bin/truet maxwaiti t napleng{�G�z�?s+ dhclient did not produce expected files: %ss , c s s! | ] } t j j | � Vq d S( N( t ost patht basename( t .0t f( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pys <genexpr>� s t unknowni i� i s killing dhclient with pid=%ssC dhclient(pid=%s, parentpid=%s) failed to daemonize after %s secondsg $@( R R R_ R` t joinR t copyt accesst X_OKt subpR= t wait_for_filest warningt rangeRH RM t intt ValueErrort get_proc_ppidt killt signalt SIGKILLRW t timet sleept error( t dhclient_cmd_pathR t cleandirt sandbox_dhclient_cmdt pid_fileRQ t cmdt missingt ppidt _t pid_contentt pid( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR> � sD % c C s t t j t | � d t �� S( s� Parse a systemd lease file content as in /run/systemd/netif/leases/ Parse this (almost) ini style file even though it says: # This is private data. Do not parse. Simply return a dictionary of key/values.t list_values( RP t configobjt ConfigObjR t False( t content( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt networkd_parse_lease s c C sw | d k r t } n i } t j j | � s1 | Sx? t j | � D]. } t t j t j j | | � � � | | <qA W| S( s� Return a dictionary of dictionaries representing each lease found in lease_d.i The top level key will be the filename, which is typically the ifindex.N( R t NETWORKD_LEASES_DIRR_ R` t isdirt listdirR� R RH Re ( t leases_dt rett lfile( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt networkd_load_leases s )c C sb | d k r t } n t d | � } x7 t | j � � D]# \ } } | j | � r7 | | Sq7 Wd S( NR� ( R R� R� t sortedR- R1 ( t keynameR� R) t _ifindext data( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt networkd_get_option_from_leases* s c s� � j d � � g t j d � � D] } | r" | ^ q" } g } � f d � } d } x^t | � D]P\ } } | | k r� qb n t | � } | t d d � k r$d } t | | � | k r� | | | t | | � � | Sd j | | d | d !� } d j | | d | | !� } | | } nq| t d d � k r�d } t | | � | k rs| | | t | | � � | Sd j | | d | d !d g � } d j | | d | | !� } | | } n�| t d d � k red } t | | � | k r| | | t | | � � | Sd j | | d | d !d d g � } d j | | d | | !� } | | } n0| t d d � k r d } t | | � | k r�| | | t | | � � | Sd j | | d | d !d d d g � } d j | | d | | !� } | | } n� | d k r�d } t | | � | k rP| | | t | | � � | Sd } d j | | d | | !� } | | } n t j d | � | S| j d | | f | f � qb W| S( s� parse rfc3442 format and return a list containing tuple of strings. The tuple is composed of the network_address (including net length) and gateway for a parsed static route. It can parse two formats of rfc3442, one from dhcpcd and one from dhclient (isc). @param rfc3442: string in rfc3442 format (isc or dhcpd) @returns: list of tuple(str, str) for all valid parsed routes until the first parsing error. E.g. sr=parse_static_routes("32,169,254,169,254,130,56,248,255,0,130,56,240,1") sr=[ ("169.254.169.254/32", "130.56.248.255"), ("0.0.0.0/0", "130.56.240.1") ] sr2 = parse_static_routes("24.191.168.128 192.168.128.1,0 192.168.128.1") sr2 = [ ("191.168.128.0/24", "192.168.128.1"), ("0.0.0.0/0", "192.168.128.1") ] Python version of isc-dhclient's hooks: /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes RB s [, .]c s' d | | | � f } t j | � d S( Ns� RFC3442 string malformed. Current route has CIDR of %s and requires %s significant octets, but only %s remain. Verify DHCP rfc3442-classless-static-routes value: %s( R Ru ( t cidrt requiredt remaint msg( t rfc3442( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt _trunc_errorR s i i i! i t .i i i i i t 0i i i i s 0.0.0.0sS Parsed invalid net length "%s". Verify DHCP rfc3442-classless-static-routes value.s %s/%s( t rstripRF RL t enumerateRm Rl RI Re R Ru RO ( R� t tokt tokensR" R� t current_idxt idxt net_lengtht req_tokst net_addresst gateway( ( R� s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyR( 4 sl + % ( + !($ R� t loggingR_ RF Rq Rs t cloudinit.netR R R R t cloudinit.net.network_stateR R' t cloudinitR R t sixR t getLoggerR R R� t ExceptionR R t objectR R R% RW R> R� R� R� R( ( ( ( s6 /usr/lib/python2.7/site-packages/cloudinit/net/dhcp.pyt <module> s, " \ J
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